JP2002290539A - Mobile communication terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile communication terminal, capable of carrying out a call at a good volume level, even if the terminal makes a radio connection in any local area. SOLUTION: A sender voice signal inputted from a transmission microphone 7 is encoded in a baseband signal processor 3 of high efficiency, via a digital volume unit 10 for adjustment of the sender voice volume. Such a gain that can cancel area difference, in particular between gain characteristics among sender voice transmission characteristics of a network facility in each local area, corresponding to each of divisions of a service are and that can provide a standard receiver sound volume at the party side, regardless of the local areas, is previously stored in a ROM 18 for volume adjustment. A controller 19, immediately after the power has been turned on, controls a radio unit 2 and the signal processor 3, in such a manner that the terminal receives a TDMA time slot signal which includes a broadcasting control channel and having the strongest electric field intensity, and reads out one of the gains, corresponding to local identification information about the broadcasting control channel from the ROM 18, and sets it in the volume unit 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication terminal, and more particularly to a mobile communication terminal capable of voice communication by wireless connection with a mobile communication network having a service area divided into a plurality of regional areas.

[0002]

2. Description of the Related Art A mobile communication terminal such as a portable telephone or a PHS can make a voice call by wireless connection with a mobile communication network. The service area of the mobile communication network is nationwide,
It covers a wide area, such as the Kanto, Kinki, and Chubu regions. If a call signal is issued from all the radio base stations in the service area when a terminal is called, the number of users is limited in order to avoid collision of call requests. Therefore, the service area is divided into a plurality of local areas (also referred to as control zones), for example, on a per-prefecture basis, and it is registered in advance in which local area the mobile communication terminal is located, A call signal is issued from all wireless base stations in the area where the communication terminal exists. In a mobile communication network, a system is often constructed in units of a local area, and one local area includes, for example, a number of radio base stations and one mobile communication control station.

[0003] By the way, if the transmission volume of the mobile communication terminal is too high or too low, it becomes difficult for the other party to hear this voice, and if the reception volume is too high or too low, the other party will not hear it. The other party's voice becomes difficult to hear. Therefore, in the transmission voice signal system and the reception voice signal system of the mobile communication terminal, the transmission voice signal level and the reception voice signal level are adjusted so that the transmission volume and the reception volume become as desirable as possible.

[0004]

However, for example, even in a situation where a call is made between two mobile communication terminals in the same area, if the area changes, the reception volume at the other mobile communication terminal or the reception volume of the other mobile communication terminal may change. The receiving volume at the mobile communication terminal on the side may change. This is due to the fact that different manufacturers of mobile communication equipment such as radio base stations and mobile communication control stations are different for each regional area, and even if the manufacturers are the same, the equipment is new or old, etc. This is because there is a difference in gain characteristics. In the case of digital mobile communication, voice signals are encoded and transmitted, so it seems that they are not affected by differences between mobile communication facilities. Due to complicated signal processing such as decoding and re-encoding of an encoded audio signal for connection or connection to a fixed telephone network, a difference in volume occurs. SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-described problems of the related art, and has as its object to provide a mobile communication terminal capable of making a call at a good volume even when wirelessly connected in any area. Further, the present invention provides a mobile communication terminal in which the relationship between the reception volume variable operation position and the actual reception volume is constant regardless of the wireless connection in any local area, when the reception volume can be changed by manual operation. With that purpose.

[0005]

According to the first aspect of the present invention, voice communication is possible by wireless connection with a mobile communication network in which a service area is divided into a plurality of local areas, and a transmission voice signal system is provided. In a mobile communication terminal in which a predetermined transmission volume adjustment value is set in the transmission volume adjustment means provided in the mobile communication terminal to adjust the transmission volume, for each regional area of the mobile communication network,
Storage means for storing a transmission sound volume adjustment value having a difference so as to cancel out a difference between transmission areas of transmission voice transmission characteristics of mobile communication network equipment, and position information notified by a control channel from a radio base station. Setting means for determining an area based on the area, reading out the transmission volume adjustment value stored in the storage corresponding to the determined area, and setting the value in the transmission volume adjustment. . Here, among the transmission voice transmission characteristics of the mobile communication network equipment in each regional area, there is a variation between the regional areas, particularly in the gain characteristic. According to the first aspect, the transmission volume adjustment value is set in the transmission volume adjusting means so as to cancel out the difference between the regional areas, and therefore, regardless of the local area in which the mobile communication terminal is used. In addition, the receiving sound volume of the other party can always be kept at a constant level. According to the invention of claim 2 of the present invention, voice communication can be performed by wireless connection with a mobile communication network in which a service area is divided into a plurality of local areas, and a predetermined volume is controlled by a receiving volume control means provided in a receiving voice signal system. In a mobile communication terminal in which a reception sound volume adjustment value is set and a reception sound volume is adjusted, a difference between reception areas of the reception voice transmission characteristics of the mobile communication network equipment for each local area of the mobile communication network is canceled. Storage means for storing a predetermined reception volume adjustment value provided with a difference between the two, and a local area is determined based on position information notified by a control channel from the radio base station, and stored in the storage means in accordance with the determined local area. Setting means for reading out the stored received sound volume adjustment value and setting the read received sound volume adjustment value in the received sound volume adjustment means. Here, among the received voice transmission characteristics of the mobile communication network equipment in each regional area, there is a variation between the regional areas especially in the gain characteristic. According to the second aspect, the received sound volume adjustment value is set in the received sound volume adjusting means so as to cancel the difference between the regional areas, regardless of the local area where the mobile communication terminal is used. The receiving volume on the side can always be kept at a constant level. According to the invention of claim 3 of the present invention, voice communication is possible by wireless connection with a mobile communication network in which a service area is divided into a plurality of local areas, and a receiving sound volume provided in a receiving voice signal system is adjusted. A mobile communication terminal comprising: a receiving sound volume adjusting means; and a receiving sound volume controlling means for setting a receiving sound volume adjusting value in the receiving sound volume adjusting means in accordance with a predetermined correspondence relationship with the receiving sound variable operation position of the receiving sound variable operating means. For each regional area of the network, the storage means stores the correspondence information between the receiving volume variable operation position and the receiving volume adjustment value provided with a difference so as to cancel the difference in the receiving voice transmission characteristic of the mobile communication network equipment between the regional areas. The reception volume control means determines the area based on the position information notified from the radio base station by the control channel, and stores the determined area in the storage means. According to the correspondence between the reception volume variable operation position of the area and the reception volume adjustment value, the reception volume adjustment value corresponding to the reception volume variable operation position of the reception volume variable operation unit is set to the reception volume adjustment unit. It is characterized by. Some mobile communication terminals can change the reception volume according to the user's preference by operating the reception volume variable operation means. By changing the variable volume operation position to the one where the volume is higher, you can make it easier to hear. By changing the variable operation position to a position where the sound volume becomes lower, it is possible to make it possible to hear better. However, there is a difference in the gain characteristic among the received voice transmission characteristics of the mobile communication equipment on the network side for each regional area, so that the received volume changes when the regional area changes even at the same variable reception volume operation position. There is fear. According to the third aspect, the received sound volume adjustment value corresponding to the received sound volume variable operation position is determined based on the correspondence between the received sound volume variable operation position and the received sound volume adjustment value provided with a difference so as to cancel the difference between the regional areas. Since it is set, if the reception volume variable operation position is the same, the same reception volume can be realized even if the regional area changes, and a consistent operation feeling can be obtained.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
An embodiment will be described. FIG. 1 shows a cellular system according to the present invention.
Configuration diagram of a mobile communication system of the mobile communication system, FIG.
Shows the configuration of a mobile phone that wirelessly connects to a station using the TDMA method
It is a block diagram. In FIG. 1, A₁~ A_nAre
An area of the mobile communication network of a digital mobile operator
A, one regional area A_i(However, i = 1, 2,
..N) mobile communication equipment is composed of a large number of radio base stations MB
S_i1, MBS_i2..And one mobile communication control station MCC_iOr
Consisting of Mobile communication control station MCC₁, MCC_TwoThe phase of
They are connected directly or indirectly by lines. Mobile phone
One local area A where the telephone MS is_iOne of the
Wireless base station MBS _ijMobile phone M when present near
S is the wireless base station MBS_ijCalls are possible by wireless connection with
It works.

[0007] By the way, each of the local areas A _{1 to An} has different voice transmission characteristics, especially gain characteristics for transmitted and received voice signals, due to the difference between mobile communication equipment manufacturers of mobile communication networks, and the difference between new and old equipment of the same manufacturer. Often there are differences. If the mobile phone MS is of a type that cannot adjust the transmission volume, the transmission volume may be too high or low depending on the area where the mobile phone MS exists, and the other party may not hear this voice. It may be easy. Similarly, if the mobile phone MS cannot adjust the receiving volume, the receiving volume may be too high or too low depending on the area where the mobile phone MS is located, and the other party may hear the other party's voice. It may be difficult.

In this embodiment, transmission / reception voice transmission characteristics of mobile communication facilities (radio base station and mobile communication control station) on the network side are different for each local area, even if the gain characteristics vary. A transmission volume control value having a difference so as to cancel the difference between the local areas is set in the digital volume section for controlling the voice volume, so that the other party can use the mobile communication terminal regardless of the local area. Can be maintained at a constant level, and the receiving volume control value with a difference set to cancel the difference between the local areas is set in the digital volume section for controlling the receiving volume. Regardless of the area where the terminal is used, the reception volume on this side can always be kept at a constant level.

Hereinafter, a specific configuration of the mobile phone MS will be described with reference to FIG. 1 is an antenna for both transmission and reception, and 2 is a radio unit, which is set to a reception mode intermittently during standby, and among continuous TDM signals of a desired frequency from the radio base station,
The baseband reception digital signal (reception TDMA
(A time slot signal) to the baseband signal processing unit. If it is necessary to transmit a transmission request or a location registration request to the radio base station while waiting, the transmission mode is set for a short time, and a burst-like baseband transmission digital signal (transmission) input from a baseband signal processing unit described later. T
It performs digital modulation of a DMA time slot signal (including data of a common bidirectional control channel), frequency conversion to a desired frequency, and power amplification, and outputs the result to the antenna 1. In a call state, the radio unit 2 is cyclically switched to a reception mode, a transmission mode, and an idle mode. In the transmission mode, digital modulation of a burst-shaped baseband transmission digital signal (transmission TDMA time slot signal, including data of an information channel) input from a baseband signal processing unit described later, frequency conversion to a desired frequency, and power consumption The signal is amplified and output to the antenna 1. In the reception mode, continuous TD of a desired frequency from the radio base station is performed.
Among the M signals, low-noise amplification, frequency conversion, and digital demodulation of an antenna reception signal of a desired time slot including a desired information channel are performed, and a baseband reception digital signal (reception TDMA time slot signal) is sent to a baseband signal processing unit. Output. Note that the radio unit 2 has a function of detecting and outputting the received electric field strength.

Reference numeral 3 denotes a baseband signal processing unit (TDMA circuit) which, in a standby state, converts data of a common access channel from a baseband reception digital signal of a time slot including a common access channel intermittently input from the radio unit 2. It is extracted and output to a controller described later. The common access channel includes incoming information by a paging channel, base station information by a broadcast channel (radio base station identification code, area identification information corresponding to an area, etc.). When it is necessary to transmit a transmission request or location registration request to the radio base station while waiting, the transmission request signal or location registration request signal input from the controller is converted to data of a common bidirectional control channel (channel for individual cell). A transmission TDMA time slot signal including the transmission TDMA signal is created and output to the radio unit 2 temporarily set in the transmission mode.

In a call state, the baseband signal processing unit 3 extracts data of the information channel and data of the associated control channel from the received TDMA time slot signal input from the radio unit 2 in the receiving mode. Of these, the high-efficiency coded received voice data is decoded (decompressed) and output as a digital received voice signal to a digital voice signal processing unit described later, and the data of the associated control channel is output to the controller. Further, the baseband signal processing unit 3 is configured to perform high-efficiency encoding of the digital transmission voice signal input from the digital voice signal processing unit, and to output information channel data including a high-efficiency coded transmission voice signal, which is input from the controller. A transmission TDMA time slot signal is created from the data of the associated control channel and output to the radio unit 2 in the transmission mode.

Reference numeral 4 denotes a digital audio signal processing unit which executes processing (equalizing) of frequency characteristics for a digital transmission / reception audio signal, noise suppression, volume control, echo cancellation, sidetone addition, and the like in the digital domain. Here, for convenience of explanation, the description of echo cancellation and addition of side sounds will be omitted. 5 is a digital audio signal processing unit 4
, A D / A converter for D / A conversion of a digital received voice signal output from the D / A converter, a receiving speaker 6 driven by the output of the D / A converter 5, a transmitting microphone 7, and a transmitting microphone 7. An A / D converter that A / D converts the output transmission voice signal and outputs the result to the digital voice signal processing unit 4.

The digital audio signal processing unit 4 includes, for example, DS
It is embodied using P (Digital Signal Processor). Of the digital audio signal processing unit 4, reference numeral 10 denotes a digital volume unit as a transmission volume control unit for adjusting the volume of the digital transmission audio signal, and reference numeral 11 denotes a digital noise suppressor unit for suppressing noise on the digital transmission audio signal. , 12 are digital equalizer sections for processing the frequency characteristics of the digital transmission voice signal. A digital voice section 10, a digital noise suppressor section 11, and a digital equalizer section 12 constitute a transmission voice signal system.

Reference numeral 13 denotes a digital equalizer for processing the frequency characteristics of the digital received voice signal, reference numeral 14 denotes a digital noise suppressor for suppressing noise of the digital received voice signal, and reference numeral 15 denotes a volume control for the digital received voice signal. It is a digital volume unit as a reception volume control unit. Digital equalizer section 13,
The digital noise suppressor section 14 and the digital volume section 15 constitute a received voice signal system. The digital volume units 10 and 15 adjust the volume by varying the gains G and g for the digital transmission / reception voice signal.

The transmission volume control value optimized by taking into account the regional difference of the gain characteristic among the transmission voice transmission characteristics of the equipment on the mobile communication network side for each local area is variably set in the digital volume unit 10. Then, the transmission volume is adjusted according to the local area so that the receiving volume at the other party is maintained at a standard constant level regardless of the difference between the local areas.

The reception volume control value optimized by taking into account the regional difference in the gain characteristic among the reception voice transmission characteristics of the equipment on the mobile communication network side for each local area is variably set in the digital volume unit 15. Then, the reception volume is adjusted according to the local area so that the reception volume on this side is maintained at a standard constant level regardless of the difference between the local areas.

Reference numeral 16 denotes a ringer that emits a ringing tone, 17 denotes a key operation unit having a power key for performing power on / off operation, a hook key for performing off-hook / on-hook operation, and the like.
18 is a volume control for ROM, local area A _i (where, i = 1,2, ·· n) area identification information indicating (in this case a local identification number) to another A-ID _i, digital volume unit a gain G _i for the 10, the gain g _i is has been stored in advance with respect to the digital volume 15. G _i is the gain of the digital volume unit 10 optimized for the transmission characteristic of the transmission voice of the mobile communication equipment on the network side of the local area A _i , especially for the gain characteristic. Of the transmission voice transmission characteristics of the equipment,
In particular, this is a gain that cancels out variations in gain characteristics so that the other party can obtain a standard reception volume regardless of the area. G _i is the gain of the digital volume unit 15 optimized for the gain characteristic, particularly, of the received voice transmission characteristics of the mobile communication equipment on the network side of the local area A _i. Among the received voice transmission characteristics of the communication equipment, the gain is such that the variation in the gain characteristic is canceled out so that a standard received sound volume can be obtained on this side regardless of the area (see FIG. 3).

Reference numeral 19 denotes a controller having a microcomputer configuration, which performs various processes required for wireless connection with a mobile communication network, such as a standby process, a location registration process, an outgoing connection process, an incoming connection process, and a digital signal of a transmission voice signal system. By variably setting the gain for the volume unit 10 and the digital volume unit 15 of the received voice signal system in accordance with the area where the mobile phone MS is located, regardless of the area where the mobile phone MS is located, Make sure that the far end and the near end always get a standard, constant volume.

FIGS. 4 and 5 are flowcharts showing the control processing of the controller 19. The operation of this embodiment will be described below with reference to these figures. The mobile phone MS is currently assumed to be located near the radio base station MBS ₁₁ local area A ₁ (see the solid line C in FIG. 1).

(1) Location Registration When a power key of the key operation unit 17 is pressed to turn on the power, the controller 19 supplies power to each unit to set the operation state, and then controls the radio unit 2 to set the reception mode. ,
A frequency search is performed in the frequency band of the mobile communication network, the reception field intensity is tuned to the TDM signal radio wave including the data of the common access channel having the highest reception electric field strength, and the reception TDMA of the time slot including the data of the common access channel is performed.
The time slot signal is output to the baseband signal processing unit 3 (step S1 in FIG. 4). The baseband signal processing unit 3 extracts the data of the common access channel and outputs the data to the controller 19. The controller 19 is common access channel area identification information of the wireless base station information included in the broadcast channel (area identification indicating the A ₁ here number A
-ID ₁ ) (step S2)
If the same area identification number has already been registered as the current position information in the built-in memory 19A, the process proceeds to the standby processing side (YES in step S3). Here, if it is not registered, the area identification number received this time is stored in the internal memory 19A.
After registration as current position information A-ID _I (step S3
NO, S4), radio unit 2 and baseband signal processing unit 3
And transmits a transmission TDMA time slot signal including a position registration signal (including a model identification number of the terminal itself and a region identification number received this time) in control data using an empty common bidirectional control channel. ₁ is transmitted (step S5). The radio base station MBS _{11 that} has received the location registration signal from the mobile phone MS, sets the upper mobile communication control station MCC _1.
To a home memory station (not shown) via the server to register the location.

(2) Digital Volume of Transmission / Reception Voice Signal System
Next, the controller 19 sets the volume control ROM 18
The area A indicated by the area identification number received this time₁To
Corresponding gain G₁Read out digital volume
By setting as a gain G of 10, the local area A₁
Wireless base station MBS₁₁, MBS₁₂Call connection with
Connection so that the other party can obtain a standard listening volume.
Set. Also, this time received from the volume control ROM 18
Area A indicated by the identified area identification information₁Gain corresponding to
g₁Is read and set in the digital volume unit 15.
By that, local area A₁Wireless base station MBS₁₁, M
BS ₁₂When receiving a call with
A setting is made so that a speaking volume can be obtained (step S6).

(3) Waiting After this, the controller 19 shifts to a waiting process. In the standby process, the wireless unit 2 is controlled to alternately repeat the reception mode and the sleep mode (step S2 in FIG. 5).
0, S21, S22), in the reception mode, the received TDMA time slot signal of the frequency and the time slot including the common access channel having the highest received electric field strength searched last time is received, and it is checked whether or not the electric field strength is above a certain level. (Step S23). If the electric field strength exceeds a certain level, the baseband signal processing unit 3 extracts the data of the common access channel and outputs the data to the controller 19. The controller 19 checks whether the area identification information in the radio base station information included in the broadcast channel among the common access channels matches the current position information registered in the internal memory 19A (step S2 in FIG. 4, S
3). If there is no coincidence due to the movement of the mobile phone MS, the process proceeds to step S4, and the above-described position registration and the resetting of the gain of the digital volume units 10 and 15 of the transmission / reception voice signal system are performed again. , It is checked whether or not there is an incoming call addressed to its own station on the broadcast channel among the common access channels (step S).
7) If not, continue waiting.

[0023] (4) When there is an incoming call or outgoing call waiting own incoming addressed in (home on the basis of the position registration in the memory station, all the radio base station MBS ₁₁ local areas A _1, MBS _12, ..), The controller 19 controls the radio unit 2 and the baseband signal processing unit 3 and responds to the radio base station MBS ₁₁ using a common bidirectional control channel (here, the first incoming call). in association with the radio base station MBS ₁₁ After responding) establishing an information channel (step S8). Then, when a ringing signal is input from the baseband signal processing unit 3 through an associated control channel associated with the information channel, the ringer 16 is driven to generate a ringing tone (step S9). When the user performs the off-hook operation by pressing the hook key, the controller 19 controls the radio unit 2 and the baseband signal processing unit 3 to transmit the incoming second response signal on the associated control channel,
The state shifts to a call state (steps S10, S11). If the user performs an off-hook operation and a dialing operation of the other party during standby (YES in step S24 of FIG. 5), a calling connection process is performed. Specifically, the controller 19 controls the radio unit 2 and the baseband signal processing unit 3, sends a call request to the radio base station MBS ₁₁ using the common bidirectional control channel, and then transmits the radio base station MBS _11.
The establishment of the information channel by integration with S _11. A call is made with the off-hook of the other party (step S2).
5).

In a call state, the controller 19 switches the radio unit 2 to a reception mode, a transmission mode, and an idle mode cyclically at a predetermined timing. During the receive mode, the receive TDMA timeslot outbound signal including the information channel addressed to the own station received radio unit 2 from the radio base station MBS _11,
Output to the baseband signal processing unit 3. The baseband signal processing unit 3 decodes the high-efficiency coded received voice signal in the information channel of the input received TDMA time slot signal and converts it into a digital received voice signal. (Not shown). Then, the data is continuously read from the built-in buffer memory and output to the digital audio signal processing unit 4. During a call, the baseband signal processing unit 3 performs high-efficiency coding on the digital transmission voice signal continuously input from the digital voice signal processing unit 4 and converts it into a high-efficiency encoded transmission voice signal.
Temporarily store in the built-in buffer memory. And an uplink TD including an information channel composed of a highly efficient coded transmission voice signal.
An MA time slot signal is generated, and the radio base station MBS is transmitted via the radio unit 2 set to the transmission mode at a predetermined timing.
Send to ₁₁ side.

The transmission voice signal input from the transmission microphone 7 is converted into a digital transmission voice signal by the A / D converter 8 and then input to the digital voice signal processing unit 4. In the digital audio signal processing unit 4, the noise component is suppressed by the digital noise suppressor unit 11, and the frequency characteristics are processed by the digital equalizer unit 12. The volume is adjusted by the digital volume unit 10. The digital volume 10, of the transmission voice signal transmission characteristic of the mobile communication equipment of the network side of the local area A _1, in particular the gain in consideration of the gain characteristic is set, the other party good reception volume Will be obtained. For example, if the gain for the transmission voice signal of the mobile communication equipment of the network side of the local area A ₁ is too small, the digital volume 10 is set gain to increase the volume, on the contrary, local area A ₁
When the gain for the transmission voice signal of the network side mobile communication equipment is too large, the digital volume 10 and so on gain to reduce the volume is set, the mobile communication equipment of the network side of the local area A ₁ Of the transmission voice signal transmission characteristics, the transmission volume is automatically adjusted to cancel out the variation in the gain characteristics.

The digital received voice signal output from the baseband signal processing unit 3 is suppressed in noise components by a digital noise suppressor unit 14, processed in frequency characteristics by a digital equalizer unit 13, and adjusted in volume by a digital volume unit 15. You. After being converted into an analog audio signal by the D / A converter 5, the analog audio signal is output from the receiving speaker 6. The digital volume 15, of the reception voice signal transmission characteristics of the mobile communication equipment of the network side of the local area A _1, in particular the gain in consideration of the gain characteristic is set, this side is obtained a good reception volume Will be done. For example, if the gain for the received voice signal of the mobile communication equipment of the network side of the local area A ₁ is too small, the digital volume 15 is set gain to increase the volume, on the contrary, the geographical area A ₁ network side of the when the gain for the received voice signal of the mobile communication equipment is too large, the digital volume 15 and so on gain to reduce the volume is set, the reception voice signal transmission in a mobile communication equipment of the network side of the local area a ₁ Of the characteristics, especially, the reception volume is automatically adjusted so as to cancel the variation in the gain characteristics.

(5) End of Call Either the user presses the hook key to perform on-hook operation during a call (YES in step S12), or the other party performs on-hook operation and disconnects on the downstream information channel or the associated control channel attached to the information channel. When a signal is received and input from the baseband signal processing unit 3 (step S1)
YES 3), the controller 19 controls the radio unit 2 and the baseband signal processing section 3, and a disconnection process in conjunction with the radio base station MBS _11, returns to the original standby state (step S14).

(6) Re-position registration and resetting of the gain of the digital volume unit During standby, the mobile phone MS moves and the radio base station MB
Away from the S _11, (see the broken line D in FIG. 1) when approaching the radio base station MBS ₂₁ local area A _2, the reception electric field strength of the TDMA time slot signal is gradually reduced to a common access channel which is searched last, step The result in S23 is NO. Then, the controller 19 returns to step S1 in FIG. 4 and performs a frequency search in the frequency band of the mobile communication network, tunes to the TDM signal radio wave having the highest received electric field strength and including the common access channel, and includes the common access channel. The baseband signal processing unit 3 outputs the received TDMA slot signal of the time slot.
The baseband signal processing unit 3 extracts the data of the common access channel and outputs the data to the controller 19. The controller 19 then reads the area identification number of the wireless base station information included in the data of the broadcast channel of the common access channel (here assumed to be A-ID ₂ showing the A ₂₎ (step S2), the built-in memory It is checked whether it matches the current position information registered in 19A (step S3). N
Since it becomes O, the above-mentioned location registration is performed again. That is, the current position information in the built-in memory 19A is re-registered with the currently received region identification number (step S4), and the transmission T including the position registration signal (including the own device identification number and the region identification information) is performed.
A DMA time slot signal is created and transmitted (step S5).

Subsequently, the controller 19 controls the volume control R
From OM18, by setting the gain G ₂ corresponding to the geographical area A ₂ shown by the area identification number A-ID ₂ received this time to the digital volume 10, the radio base station MBS _21, MBS in local area A _{2 22} , Set the other party to obtain a standard reception volume when connecting to a call. Also, the volume control for ROM 18, corresponding to the geographical area A ₂ shown by the currently received area identification information gain g
By setting ₂ to the digital volume 15 reads the radio base station MBS _21, MB in the geographical area A ₂
S _22, when the call connection to the ... standard receiver volume is set so as to give on this side (step S6).

As a result, the mobile phone MS is in the local area A ₁
When it moved to A ₂ from the automatic particularly handset volume control to cancel the difference in gain characteristics of the handset audio signal transmission characteristics of the mobile communication equipment of the network side between the local area A ₁ and A ₂ because it is made in, the other side is a mobile phone MS is maintained the same standard earpiece volume at the time of the call at the time was in the region area a _1, the mobile phone MS regional area a ₁ also this side
, The same standard receiving sound volume as that at the time of the call at the time of the call is maintained. The mobile phone MS is in another area A ₃ ,
The same is true when moving to A ₄ .

According to this embodiment, each local area A
₁ , A ₂ , A ₃ , A _{4, etc.} , separately, out of the transmission voice transmission characteristics of the mobile communication equipment (radio base station and mobile communication control station) on the network side that carries out mobile communication in the local area, especially gain Predetermined gains G ₁ , G ₂ , G ₃ , G _4, ... Providing differences so as to cancel out differences between characteristic area areas, and received voices of mobile communication equipment on the network side that is responsible for mobile communication within the area area. Predetermined gains g ₁ , g ₂ , g ₃ , g _4.
Are stored in the volume control ROM 18. Then, the local area determined based on the area identification information notified by the control channel from the radio base station MSB _ij local area A _i of the mobile phone MS is present, the volume adjusting ROM18 in association with the geographical area that the determination Since the stored gain for adjusting the transmission volume is read out and set in the digital volume unit 10 provided in the transmission voice signal system, the other party can use the mobile phone MS regardless of where the local area is located. Can be kept at a constant level, and the reception volume adjustment gain stored in the volume adjustment ROM 18 is read out in association with the determined area, and the digital volume provided in the reception voice signal system is read out. Since the setting is made in the unit 15, the reception volume on the local side is always constant irrespective of the area where the mobile phone MS is used. It is possible to maintain the level.

FIG. 6 is a specific configuration diagram of a mobile phone MS 'according to the second embodiment of the present invention, and the same components as those in FIG. 2 are denoted by the same reference numerals. The mobile phone MS of FIG.
Although the user could not change the receiving sound volume by manual operation, the mobile phone MS 'in FIG. 6 can change the receiving sound volume by manual operation. The key operation unit 17 ′
A receiving volume up / down key 170 is added,
By operating the reception volume up / down key 170,
10 from minimum reception volume position 1 to maximum reception volume position 10
It can be variably operated to any one of the received sound volume variable operation positions (represented by P) among the operation positions of the stages.

The controller 19 'increases P by one each time the user performs the reception volume up operation with the reception volume up / down key 170 because the user is too distant or the surrounding environment is noisy (however, P Is not changed when the number reaches 10.) On the other hand, the reception volume up / down key 17
Each time the receiving sound volume down operation is performed at 0, P is reduced by one (however, when P has reached 1, it is not changed).
Each time P increases or decreases, the digital volume unit 15
The gain g, which is the sound volume adjustment value, is increased or decreased.

Here, the conventional relationship between the variable operation position P of the received sound volume and the gain g of the digital volume unit 15 is one type as shown in FIG. However, as described above, there is a variation in the reception voice transmission characteristics of the mobile communication facilities (the radio base station and the mobile communication control station) on the network side, and in particular, the gain characteristics are different for each local area.
When the area where 'is used changes, the relationship between the reception volume variable operation position and the reception volume changes, and the operation position must be changed before and after the change of the area to change the operation position. . For example, P = 1
Of the ten operation positions of 10 to 10, the earphones were far away, so in the area where they were, they were adjusted to the reception volume variable operation position of P = 7. If the gain with respect to the received voice signal is lowered, the received voice volume will be reduced. Therefore, if you do not change to the received voice volume variable operation position of P = 8 or 9, you will not be able to hear well, or conversely, in the mobile communication equipment on the network side, If the gain with respect to the received voice signal is increased, the volume of the received voice is increased. Therefore, the voice of the other party will be too loud unless the reception volume variable operation position of P = 6 or 5 is changed.

In this embodiment, for each local area,
Among the received voice transmission characteristics of the mobile communication equipment on the network side, particularly, the received volume variable operation position and the digital volume unit 15 provided with a difference so as to cancel the difference between the regional areas of the gain characteristic.
The correspondence information of the gain g of the mobile phone M is prepared in advance.
When the area where S 'is located changes, the reception volume variable operation position and the gain g of the digital volume unit 15 are changed.
By automatically switching the correspondence between the two areas, even if there is variation in the received voice transmission characteristics of mobile communication equipment on the network side, especially in the gain The relationship between the variable operation position and the receiving sound volume is set to be the same.

[0036] volume control for ROM18', each regional area A _i (where, i = 1, 2, · · n) area identification information indicating (in this case a local identification number) to another A-ID _i,
Radio base station MBS _i1 in the local area A _i, MBS _i2,
..Digital volume unit 1 suitable for connection with telephone call
0 is the gain, of the transmitted voice transmission characteristics of the mobile communication equipment of the network side of the local area A _i, in particular cancel the variation in regional areas of the gain characteristics, standard in mating regardless of geographical area Gain G so that receiving volume can be obtained
_i is stored in advance (this is the same as in the first embodiment).

Further, the volume control for ROM18', each regional area A _i (where, i = 1, 2, · · n) area identification information indicating (in this case a local identification number) of the A-ID _i Separately, the radio base stations MBS _i1 , MB in the local area A _i
The gain g _i (P) for each reception volume variable operation position of the digital volume unit 15 suitable for a call connection with S _i2,.
(P = 1, 2, 3,..., 10) are stored in advance (see FIGS. 8 and 9). i is the same gain g _i (1) to g
group _i (10), in the geographical area A _i, the correspondence relationship information receiver volume variable operating position and gain used for the controller 19 'sets the gain of the digital volume 15. There is a case where there is a difference in the correspondence relationship information between the reception volume variable operation position and the gain depending on the local area, because there is a difference in the reception voice signal transmission characteristic of the mobile communication equipment on the network side, especially in the gain characteristic, between the local areas. This is for canceling the variation and making the correspondence between the reception volume variable operation position and the reception volume constant regardless of the area. In addition, g of the receiving volume variable operation position P = 5
₁ (5), g ₂ (5),..., G _n (5) are each shown in FIG.
G _1, in g _2, · ·, have the same gain and g _n, P
= 5 is an operation position where a standard reception sound volume can be obtained.

The controller 19 'performs various processes required for wireless connection with the mobile communication network, such as a standby process, a location registration process, an outgoing connection process, and an incoming connection process. A volume adjustment control process is performed on the digital volume unit 15 of the received voice signal system. The other components of the mobile phone MS 'are configured in exactly the same manner as in FIG.

FIGS. 10 and 11 are flow charts showing the main control processing of the controller 19 ', and FIG. 12 is a flow chart showing the interrupt control processing of the controller 19'. The operation will be described. The mobile phone MS' currently assumed to be located near the radio base station MBS ₁₁ local area A ₁ (see the solid line C in FIG. 1). The controller 19
It is assumed that the received sound volume variable operation position P managed by the internal memory 19A of the '′ is initially standard P = 5.

(1) Location Registration When the power key is pressed by pressing the power key of the key operation unit 17 ', the controller 19' controls the radio unit 2 after receiving power by supplying power to each unit. Mode, a frequency search is performed within the frequency band of the mobile communication network, the reception electric field strength is tuned to the TDM signal radio wave including the data of the common access channel and the reception TD of the time slot including the data of the common access channel is tuned.
The MA time slot signal is output to the baseband signal processing unit 3 (step S1 in FIG. 10). The baseband signal processing unit 3 extracts the data of the common access channel and outputs the data to the controller 19. The controller 19 then reads the area identification information of the wireless base station information included in the broadcast channel of the common access channel (here assumed to be local identification number A-ID ₁ showing the A ₁₎ (step S
2) If the current position information has already been registered in the built-in memory 19A, the process proceeds to the standby process (step S).
3 is YES). Here after registration as the current position information A-ID _I in the internal memory 19A the area identification number received this time When not a registered (NO in step S3, S
4) controlling the radio unit 2 and the baseband signal processing unit 3;
By using the common two-way control channel idle, transmitting TDMA timeslot signal containing the location registration signal (including the model identification number and the currently received area identification number of its own) in the control data on the side of the radio base station A ₁ Send (Step S
5). Mobile telephone radio base station MBS ₁₁ that has received the location registration signal from the MS sends to the home memory station (not shown) via a mobile communication control station MCC ₁ of the upper, to the location registration.

(2) Digital Volume of Transmission / Reception Voice Signal System
Next, the controller 19 sets the volume control ROM 18 ′
The local area A indicated by the current location information_I= A₁Corresponding to
Gain G₁And read the digital volume
By setting the gain G, the area A₁In
Wireless base station MBS₁₁, MBS₁₂When connecting to a call with
The other party to obtain a standard listening volume.
You. The current position information in the volume control ROM 18 '
Area A indicated by_I= A₁Variable reception volume operation suitable for
Correlation between position and gain g of digital volume unit 15
Engagement information (g₁(1) -g₁(10) gain group)
The digital signal corresponding to the current receiving volume variable operation position.
Gain g of volume unit 15 ₁(5) Find digital
By setting in the volume section 15, the area A₁of
Wireless base station MBS₁₁, MBS₁₂Call connection with
Set a standard listening volume that is suitable at times
(Step S6 ').

(3) Waiting After this, the controller 19 'shifts to a waiting process. In the standby process, the wireless unit 2 is controlled to alternately repeat the reception mode and the sleep mode (step S2 in FIG. 11).
0, S21, S22), in the reception mode, the received TDMA time slot signal of the frequency and the time slot including the common access channel having the highest received electric field strength searched last time is received, and it is checked whether or not the electric field strength is above a certain level. (Step S23). If the electric field strength is higher than a certain level, the data of the common access channel is extracted by the baseband signal processing unit 3 and output to the controller 19 '. The controller 19 'checks whether the area identification information in the radio base station information included in the broadcast channel among the common access channels matches the current position information A-ID _I registered in the internal memory 19A (FIG. Ten steps S2, S3). If there is no coincidence due to the movement of the mobile phone MS ', the process proceeds to step S4, and the digital volume unit 1 of the position registration and the transmission / reception voice signal system described above is again performed.
The gains of 0 and 15 are reset. Here, if the gains match in step S3, it is checked whether there is an incoming call addressed to the own station on the broadcast channel among the common access channels (step S7). To continue.

[0043] (4) When there is an incoming call or outgoing call waiting own incoming addressed in (home on the basis of the position registration in the memory station, all the radio base station MBS ₁₁ local areas A _1, MBS _12, ..), The controller 19 ′ controls the radio unit 2 and the baseband signal processing unit 3, and responds to the radio base station MBS ₁₁ using a common bidirectional control channel (here, the terminating 1
In association with the radio base station MBS ₁₁ After responding) establishing an information channel (step S8). Then, when a ringing signal is input from the baseband signal processing unit 3 through an associated control channel associated with the information channel, the ringer 16 is driven to generate a ringing tone (step S9). When the user performs an off-hook operation by pressing the hook key, the controller 19 'controls the radio unit 2 and the baseband signal processing unit 3 to transmit an incoming second response signal on the associated control channel, and shifts to a call state (step S10). , S11).
If the user performs an off-hook operation and a dialing operation of the other party during standby (YES in step S24 of FIG. 11), an outgoing connection process is performed. Specifically, the controller 19 'controls the radio unit 2 and the baseband signal processing section 3, the radio base station MBS ₁₁ After origination request to the side of the radio base station MBS ₁₁ using a common bidirectional control channel Establish an information channel by coordination. A call is made with the off-hook of the other party (step S2).
5).

In the call state, the controller 19 'cyclically switches the radio unit 2 to the reception mode, the transmission mode, and the idle mode at a predetermined timing. In the reception mode, the radio unit 2 receives a downlink reception TDMA time slot signal including an information channel addressed to the own station from the radio base station MBS ₁₁ and outputs the signal to the baseband signal processing unit 3. The baseband signal processing section 3 decodes the high-efficiency coded received voice signal in the information channel of the received TDMA time slot signal, converts the decoded signal into a digital received voice signal, and temporarily stores it in a built-in buffer memory. Then, the data is continuously read from the built-in buffer memory and output to the digital audio signal processing unit 4. During a call, the baseband signal processing unit 3 converts the digital transmission voice signal continuously input from the digital voice signal processing unit 4 into a high-efficiency coded transmission voice signal by high-efficiency coding, and temporarily stores it in the built-in buffer memory. Remember.
Then, an uplink TDMA time slot signal including an information channel composed of a highly efficient coded transmission voice signal is generated, and transmitted to the radio base station MBS ₁₁ via the radio unit 2 in the transmission mode at a predetermined timing. .

The transmission voice signal input from the transmission microphone 7 is converted into a digital transmission voice signal by the A / D converter 8 and then input to the digital voice signal processing unit 4. In the digital audio signal processing unit 4, the noise component is suppressed by the digital noise suppressor unit 11, and the frequency characteristics are processed by the digital equalizer unit 12. The volume is adjusted by the digital volume unit 10. The digital volume 10, of the transmission voice signal transmission characteristic of the mobile communication equipment of the network side of the local area A _1, in particular the gain in consideration of the gain characteristic is set, the other party is a standard earpiece volume Is obtained.

The digital received voice signal output from the baseband signal processing unit 4 is noise-suppressed by a digital noise suppressor unit 14, the frequency characteristics are processed by a digital equalizer unit 13, and the volume is adjusted by a digital volume unit 15. You. After being converted into an analog audio signal by the D / A converter 5, the analog audio signal is output from the receiving speaker 6. The digital volume 15, of the received voice transmission characteristics of the mobile communication equipment of the network side of the local area A ₁ (a radio base station and a mobile communication control station), in particular the gain in consideration of the gain characteristic is set, This side can also obtain a standard reception volume.

(5) Reception Volume Change Operation After turning on the power, the controller 19 'periodically repeats the interruption control process of FIG. 12 in parallel with the main control process of FIGS. It is checked whether an up operation or a down operation has been performed with the down key 170 (steps S30 and S31 in FIG. 12). If the user wants to increase the received sound volume above the standard during a call because, for example, the ear is far away, the user operates the received sound volume up / down key 170 of the key operation unit 17 'to perform the desired number of times of up operations. When the first up operation is performed, the controller 19 '
Checks whether the current location information has been registered, and since YES, checks whether P = 10 (steps S32 and S3).
3). Since P is NO, P is incremented by 1 to 6 (step S3).
4) Correspondence information (g ₁ (1) to (g ₁ (1) to) of the reception volume variable operation position suitable for the local area A _I = A ₁ indicated by the current position information and the gain g of the digital volume section 15 in the volume adjustment ROM 18 ′ g ₁ (10) gain group)
The gain g ₁ (6) of the digital volume unit 15 corresponding to the local area A _I = A ₁ and P = 6 is obtained and set in the digital volume unit 15 (step S35). As a result, the received sound volume increases by one level.

The received sound volume is not enough yet,
When the second up operation is performed, P becomes 8 in the same manner, and the gain g ₁ (8) is set in the digital volume unit 15. As a result, the received sound volume increases by two levels. If the volume has become too large, the receiver volume up / down key 170 of the key operation unit 17 'is operated to perform a single down operation, and the controller 19' checks whether the current position information has been registered. 1 is checked (steps S31, S36, S37). Since it is NO, P is decremented to 7 by 7 (step S38), and the receiving sound volume variable operation position suitable for the local area A _I = A ₁ indicated by the current position information and the gain of the digital volume unit 15 in the volume adjusting ROM 18 '. with g relationship information (g ₁ (1) to g ₁ gain group (10)), set the digital volume 15 obtains a gain g ₁ (7) of the digital volume 15 corresponding to P = 7 I do. As a result, the received sound volume decreases by one level.

(6) End call Whether the on-hook operation is performed by pressing the hook key during a call (YES in step S12 in FIG. 10), or the other party performs the on-hook operation and uses the downstream information channel or the associated control channel attached to the information channel. When the disconnection signal is received and input from the baseband signal processing unit 3 (step S
YES 13), the controller 19 controls the radio unit 2 and the baseband signal processing section 3, and a disconnection process in conjunction with the radio base station MBS _11, returns to the original standby state (step S14). Note that, even when the user performs the reception volume changing operation during standby, the set gain of the digital volume unit 15 is changed in the same manner as described above. In the following, P = 7
It will be explained that it was.

(7) Relocation registration and resetting of the digital volume part of the transmission / reception voice signal system During standby, the mobile phone MS 'moves and the radio base station M
The radio base station MBS _{21 in the} area A ₂ away from the BS ₁₁
(See the broken line D in FIG. 1), the received electric field strength of the TDMA time slot signal including the common access channel searched last time gradually decreases, and step S23 is performed.
Is NO. Then, the controller 19 'returns to step S1 in FIG. 10 to perform a frequency search in the frequency band of the mobile communication network, tune to the TDM signal radio wave having the largest received electric field strength and including the common access channel,
Reception TD of time slot including common access channel
The MA slot signal is output to the baseband signal processing unit 3. The baseband signal processing unit 3 extracts the data of the common access channel and outputs it to the controller 19 '.
The controller 19 '(assumed to be A-ID ₂ showing the A ₂ here) area identification number of the wireless base station information included in the data of the broadcast channel of the common access channel
Is read (step S2), and it is checked whether it matches the current position information A-ID _I registered in the internal memory 19A (step S3). Since the result is NO, the above-described location registration is performed again. That is, the current position information in the built-in memory 19A is re-registered with the currently received region identification number (step S4), and a transmission TDMA time slot signal including a position registration signal (including the own device identification number and the region identification information) is created. (Step S5).

Subsequently, the controller 19 'is used for volume control.
Local area A indicated by current position information from ROM 18 '_I
= A_TwoGain G corresponding to_TwoRead digital volume
By setting the gain G of the
Rear A_TwoWireless base station MBS_{twenty one}, MBS_{twenty two},··When
Can get a standard listening volume when connected
Set as follows. In the volume control ROM 18 ',
Current location information A-ID _IArea A indicated by_I= A_TwoTo
Suitable receiving volume variable operation position and digital volume section
15 corresponding to the gain g (g_Two(1) -g_Two(1
0), the current received sound volume variable operation position
G of the digital volume unit 15 corresponding to the position_Two
(7) is obtained and set in the digital volume unit 15.
And the area A_TwoWireless base station MBS_{twenty one}, MB
S_{twenty two}When connecting to a call with₁With the receiving sound
The same receiving volume as when the variable volume operation position is set to 7 is obtained.
So that the other party's voice can be heard well
(Step S6 ').

As a result, the mobile phone MS 'is located in the area A
When moved to A ₂ from _1, of the handset audio transmission characteristics of the mobile communication equipment of the network side between the local area A ₁ and A _2, in particular handset volume control automatically to cancel the difference in gain characteristics Therefore, the other party uses the mobile phone MS in the local area A _1.
And the same good receiving volume as during a call when
This side also will be the same receiver volume at the time of call when the mobile phone MS' were in the regional area A ₁ is obtained, need especially without the earpiece volume variable operation. The same is true when the mobile phone MS 'moves to another local area A ₃ , A ₄ .

According to this embodiment, each local area A
₁ , A ₂ , A ₃ , A _{4, etc.} , separately, out of the transmission voice transmission characteristics of the mobile communication equipment (radio base station and mobile communication control station) on the network side that carries out mobile communication in the local area, especially gain The predetermined gains G ₁ , G ₂ , G ₃ , G _4, ... Provided with differences so as to cancel the differences between the characteristic area areas are provided in the volume control ROM 1.
8 '. Then, the local area determined based on the area identification information notified by the control channel from the radio base station MSB _ij local area A _i of the mobile phone MS is present, for volume control in association with the geographical area that the determination ROM18' Is read out and set in the digital volume unit 10 provided in the transmission voice signal system, so that the other party can use the mobile phone MS regardless of where the local area is located. Can always keep the reception volume at a constant level. In addition, for each regional area A ₁ , A ₂ , A ₃ , A _4. Of these, the reception volume variable operation position and the digital volume unit 15 provided with a difference so as to cancel the difference between the local areas of the gain characteristic in particular.
Is stored in the volume control ROM 18 '. The mobile phone MS' local area determined based on the area identification information notified by the control channel from the radio base station MSB _ij local area A _i are present, RO for volume control in association with the geographical area that the determination
The gain for the current received sound volume variable operation position is set in the digital volume unit 15 using the correspondence information between the received sound volume variable operation position and the gain of the digital volume unit 15 stored in M18 '. , The same received sound volume can be automatically obtained at the same received sound volume variable operation position.

In the embodiment shown in FIG. 6, the receiving sound volume variable operation position can be changed in ten steps from 1 to 10, but it can be changed to other than ten steps such as five steps, seven steps, and twelve steps. You may do so, and from 1 to 1
You may make it continuously variable continuously to 0.
Further, in each of the above-described embodiments, the transmission volume adjustment unit and the reception volume adjustment unit are configured in the digital domain, but may be configured in the analog domain. Although the area is determined by the area identification information, since the wireless base station identification information is transmitted on the broadcast channel, a correspondence table between the wireless base station identification information and the area is stored in the volume control ROM in advance. In addition, the local area may be determined from the correspondence table between the wireless base station identification information and the local area based on the received wireless base station identification information. In the above embodiments, the present invention is applied to a mobile phone as an example. However, the present invention can be applied to a PHS (Personal Handy Phone System), a wireless device for business use and a hobby, and the like.

[0055]

According to one aspect of the present invention, if the area where the mobile communication terminal is located changes, the transmission / reception voice signal transmission characteristic of the mobile communication equipment on the network side of the new area is suitable. Since the transmission (reception) speech volume adjustment value is automatically set, even if there is a difference in transmission (reception) speech signal transmission characteristics, especially gain characteristics, of the mobile communication equipment on the network side for each local area, On this side, a good reception volume is always obtained. According to another aspect of the present invention, a reception volume corresponding to a reception volume variable operation position is determined based on a correspondence relationship between a reception volume variable operation position and a reception volume adjustment value provided with a difference so as to cancel a difference between local areas. Since the sound volume adjustment value is set, the same sound receiving sound volume can be realized even if the regional area changes if the sound receiving volume variable operation position is the same, and a consistent operation feeling can be obtained.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a mobile communication system according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a mobile phone according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram of storage contents of a volume adjustment ROM in FIG. 2;

FIG. 4 is a flowchart showing a control process of a controller in FIG. 2;

FIG. 5 is a flowchart showing a control process of a controller in FIG. 2;

FIG. 6 is a block diagram showing a mobile phone according to a second embodiment of the present invention.

FIG. 7 is a diagram showing a conventional relationship between a reception volume variable operation position and a gain of a digital volume unit of a reception voice signal system.

FIG. 8 is an explanatory diagram of storage contents of a volume control ROM in FIG. 6;

FIG. 9 is a diagram showing a correspondence relationship between a reception sound volume variable operation position and a gain of a digital volume unit of a reception sound signal system in the second embodiment.

FIG. 10 is a flowchart showing a control process of a controller in FIG. 6;

FIG. 11 is a flowchart showing a control process of a controller in FIG. 6;

FIG. 12 is a flowchart showing control processing of a controller in FIG. 6;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Antenna 2 Radio part 3 Baseband signal processing part 4 Digital audio signal processing part 6 Receiving speaker 7 Transmitting microphone 10, 15 Digital volume part 17, 17 'Key operation part 170 Receiving sound volume up / down key 18, 18' Volume control ROM 19, 19 'Controller 19A Built-in memory

Claims (3)

[Claims] A voice communication is possible by wireless connection with a mobile communication network in which a service area is divided into a plurality of local areas, and a predetermined transmission volume control is performed by a transmission volume control means provided in a transmission voice signal system. In a mobile communication terminal in which a value is set and a transmission volume is adjusted, for each local area of the mobile communication network, the difference between the transmission areas of the transmission voice transmission characteristics of the mobile communication network equipment between the local areas is canceled. Storage means for storing a transmission volume adjustment value having a difference; and an area determined based on position information notified by a control channel from the radio base station, and stored in the storage corresponding to the determined area. Setting means for reading out the transmission volume adjustment value and setting the same in the transmission volume adjustment unit. 2. A voice communication is possible by wireless connection with a mobile communication network in which a service area is divided into a plurality of regional areas, and a predetermined reception volume adjustment value is set in a reception volume control means provided in a reception voice signal system. A mobile communication terminal configured to adjust the reception volume by using a predetermined difference provided so as to cancel out the difference between the local areas in the reception voice transmission characteristics of the mobile communication network equipment for each local area of the mobile communication network. Storage area storing the received sound volume adjustment value, and determining the area based on the position information notified from the wireless base station by the control channel, and controlling the received sound volume stored in the storage means corresponding to the determined area. Setting means for reading a value and setting the value in the receiving sound volume adjusting means; and a mobile communication terminal comprising: 3. A receiving sound volume adjusting means for controlling a receiving sound volume provided in a receiving sound signal system, wherein voice communication is possible by wireless connection with a mobile communication network in which a service area is divided into a plurality of regional areas, A reception volume control unit for setting a reception volume adjustment value in the reception volume adjustment unit according to a predetermined correspondence relationship with the reception volume variable operation position of the reception volume variable operation unit; The storage means stores the correspondence information between the reception sound volume variable operation position and the reception sound volume adjustment value having a difference so as to cancel the difference between the local areas of the reception sound transmission characteristics of the mobile communication network equipment, The control means determines the local area based on the position information notified from the wireless base station by the control channel, and, among the storage sounds stored in the storage means, the reception sound of the determined local area. According to the correspondence between the variable operation position and the reception volume adjustment value, the reception volume adjustment value corresponding to the reception volume variable operation position of the reception volume variable operation unit is set in the reception volume adjustment unit. Mobile communication terminal.